doyen noun

/ˈdɔɪ.en/, /dwaɪˈen/ n [C usually singular]

Definition

the oldest, most experienced, and often most respected person of all the people involved in a particular type of work

(Definition of doyen noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Synonyms and related words:

If a problem preys on your mind, you think about it and worry about it a lot

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